/Engine/Plugins/Online/OnlineServices/Source/OnlineServicesInterface/Public/Online/Achievements.h
struct FAchievementState
FString
AchievementId
Achievement that this state relates to
float
Progress
Progress towards unlocking this achievement, as a percentage in the range [0.0, 1.0].
FDateTime
UnlockTime
If unlocked, the time this achievement was unlocked